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fix(st-uart): correctly fill BRR register 

To get the nearest divisor for BRR register, we use:
Divisor =  (Uart clock + (baudrate / 2)) / baudrate
But lsl was wrongly used instead of lsr to have the division by 2.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: Iedcc3ccdb4cf8268012e82a66df2a9ec48fc1d79
This commit is contained in:
Yann Gautier 2022-02-28 17:29:49 +01:00 committed by Yann Gautier
parent b298d4df5e
commit af7775ab53
1 changed files with 2 additions and 2 deletions
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4
drivers/st/uart/aarch32/stm32_console.S
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -67,7 +67,7 @@ func console_stm32_core_init
bic r3, r3, #USART_CR2_STOP
str r3, [r0, #USART_CR2]
/* Divisor = (Uart clock + (baudrate / 2)) / baudrate */
lsl r3, r2, #1
lsr r3, r2, #1
add r3, r1, r3
udiv r3, r3, r2
str r3, [r0, #USART_BRR]